Models HK21e Belt fed machine gun 165 1193 9 HK21e Bolt and carrier group 60 647 4 HK21E receiver weldment, Pivot for feed mech 37 326 0 HK21E and MSG90 STANAG quick detach scope mount 29 353 0 HK21E Belt Feed mechanism (7.62x51) 82 782 8 PSG-1 Tripod 35 413 1